Phytosynthetic Fabrication of Lanthanum Ion-Doped Nickel Oxide Nanoparticles Using <i>Sesbania grandiflora</i> Leaf Extract and Their Anti-Microbial Properties

• Main Authors: Srihasam Saiganesh, Thyagarajan Krishnan, Golla Narasimha, Hesham S. Almoallim, Sulaiman Ali Alhari, Lebaka Veeranjaneya Reddy, Koduru Mallikarjuna, Arifullah Mohammed, Vattikuti S. V. Prabhakar
• Format: Article
• Language: English
• Published: MDPI AG 2021-01-01
• Series: Crystals
• Subjects: <i>Sesbania grandiflora</i> leaf extract; green synthesis; NiO nanoparticles; characterization; antibacterial activity
• Online Access: https://www.mdpi.com/2073-4352/11/2/124

Over the past few years, the photogenic fabrication of metal oxide nanoparticles has attracted considerable attention, owing to the simple, eco-friendly, and non-toxic procedure. Herein, we fabricated NiO nanoparticles and altered their optical properties by doping with a rare earth element (lanthanum) using <i>Sesbania grandiflora</i> broth for antibacterial applications. The doping of lanthanum with NiO was systematically studied. The optical properties of the prepared nanomaterials were investigated through UV-Vis diffuse reflectance spectra (UV-DRS) analysis, and their structures were studied using X-ray diffraction analysis. The morphological features of the prepared nanomaterials were examined by scanning electron microscopy and transmission electron microscopy, their elemental structure was analyzed by energy-dispersive X-ray spectral analysis, and their oxidation states were analyzed by X-ray photoelectron spectroscopy. Furthermore, the antibacterial action of NiO and La-doped NiO nanoparticles was studied by the zone of inhibition method for Gram-negative and Gram-positive bacterial strains such as <i>Escherichia coli</i> and <i>Bacillus sublitis</i>. It was evident from the obtained results that the optimized compound NiOLa-04 performed better than the other prepared compounds. To the best of our knowledge, this is the first report on the phytosynthetic fabrication of rare-earth ion Lanthanum (La³⁺)-doped Nickel Oxide (NiO) nanoparticles and their anti-microbial studies.